What's up? Help with Twitter app for WP please

Hey! Here's the thing: I can't seem to tweet on the app, there's no Tweet button. I changed the phone theme from Dark to Light(because why not?) and well, the verdict is: I don't have a Tweet button. Weird thing is I can see it in my laptop app. Thanks for reading and I hope you can help me.
Phone: Microsoft Lumia 435 with Windows 10 Mobile.

Last edited by Steve Mataa; 11-07-2016 at 12:59 AM.
Reason: Adding important information

Hey! Here's the thing: I can't seem to tweet on the app, there's no Tweet button. I changed the phone theme from Dark to Light(because why not?) and well, the verdict is: I don't have a Tweet button. Weird thing is I can see it in my laptop app. Thanks for reading and I hope you can help me.
Phone: Microsoft Lumia 435 with Windows 10 Mobile.